Strong solar storm could produce northern lights in US and disrupt communications

CAPE CANAVERAL, Fla. — An unusually strong solar storm could produce northern lights in the U.S. this weekend and potentially disrupt power and communications.

The National Oceanic and Atmospheric Administration issued a rare severe geomagnetic storm warning when a solar outburst reached Earth on Friday afternoon, hours sooner than anticipated. The effects were due to last through the weekend and possibly into next week.

NOAA alerted operators of power plants and spacecraft in orbit to take precautions...